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Even though the quality of the film is not so good i managed to see Colin Firth's crying scenes in this and they're pretty amazing. In the first one ( it's at 13:44) he starts crying while cooking ( i had the vague impression he was cutting onions but i can't tell actually ) and then he goes to the toilet cabin to cry in silence and wash his face. Stanley Tucci looks on the verge of crying as well, his eyes look slightly watery too in this one. The other one starts at 1:09:00 during the dinner. They have a troubling conversation about caring for Stanley Tucci's character whose health is declining. He's wiping his nose at the beginning of this scene and then Colin Firth's face is shown in a close up all flushed and with tears streaming down.
https://www.filmeo.ro/supernova/
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This one is far better in terms of resolution. And it seems he was cutting onion in that scene and then he touches his eyes..
https://filmehd.to/filme/supernova-2021/